Plate spring



E. BURNAND PLATE SPRING Nov. 18, 1930.

Filed Nov. 25, 1929 Inman/2f; f. /rwa 714/,

vPatented (Nov. 18, `193 d j ERNEsT BURNAND, or. PARIS, FRANCE vPLATE SPRING A -Applieatien ineav November 25,- 17929, seriai No.

. The present invention relates to -plate springs, and chieflyto the springsemployed for the suspension of vehicles.A

The invention consists lin interposing an 5 auxiliary plate between the ordinary plates of the spring, and in the use of'means such that the variations of deflection of said spring willcause-a considerableslipping of the auxiliary plate with reference to the main'set 10 of plates, and since'this slipping is impededl by the friction .of the auxiliary plate" upon the adjacentpl'ates, the movements of the* spring will be themselves impeded.Y

To obtain this result, I preferablyfdispose, '15 within the set of plates, an auxiliary platewhich4 is cut off at a point near the center, andis connected at the outer end` to the cor-y responding end of the main plate, and thus the auxiliary plate is actuated by the main 2-0 plate withv a relative vmovement which absorbs a considerable work of friction, said auxiliary'plate being pressed againstother spring 'plates upon its whole length and upon both-faces. y

The effect of friction'and hence the impeding action will be the greater according as al greater number of intermediaryplates separatethe actuatedau-xiliary plate from the o plate to whose end it is attached. The connection between the auxiliary plate and the main plate may be effected with the interposition of a play or elastic packing, or by a rigid mounting. f A v The accompanying drawings show byway of example a spring according to the present invention, and herein the auxiliaryplate is secured to the main plate wit-hout play, and by winding it about the axle.

Fig. l is a cross sectional longitudinal view of thespring; d f

Fig. 2 is across sectional viewtakenat right angles to Fig. l looking towards the K j center.` of the springl from a' point outside of the cross pieces 14; and, e p -V y y Fig. 3 is apartial elevational View of a detail'. f Y In .this example, the auxiliary plate lextends from the vouter end of the spring asfar as a sectioned place 2.adjacent the vmiddle Viliary plate.

Vmain plate by winding it at 6- about the in close contact at a certain pressure. Y

plate connected tothe-end of the main plate,

vsaid auxiliary plate.

'plates situated on each side of the set of 409,707, and neermeny November 29, 192e.y

vaxis of the spring. Between this auxiliary spring plate and the main'platef is interposed one of the spring plates 4 of the gen-y eral set of plates forming the spring, `and e the lremainder are disposed below the aux- 5 5 A The said auxiliary plate is secured to the spring eye 7 plate itself. n

Suitable pressing n of the spring, as is the main plates 8 are disposed kabove yand below the spring and are held by astrap or clip which maintains. the plates The said plates are preferablyprovided with perforations 10 which are in communid cation andare supplied by an oiler 11.

VAccording to a preferreddisposition for xing the plates andthe clips, suchclips con-y sist of two end plates provided with apertures into which are inserted the ends of cross-piecesy 14. In each cross-piece are two notches-15 into which are fitted the walls corresponding to the `apertures of the plates 12; the elastic effect of the spring plates 8 is suiii-` f cient `to maintain the cross-pieces in the plates12. This arrangement affords a-ready construction.

Having now particularly described and ascertained the nature of my invention-and 18'9- in what manner Ythe same is to be performed, Y I declare that what I claim is:

l. A plate spring comprising an auxiliary it being interposed in the set of spring plates vand slidable with reference to said plates.

is inserted between the main plate and the,k

spring plates which are held by flanges.

4l. Aspring plate as claimed in claim l, in which the several plates are pressed together, in order to increase the friction, by

small plates situated on each side of the Y Vset of spring pla-tes, which are held by anges,

consisting of two cheeks Connected together by cross-pieces Whose ends comprise a notch ttng into a corresponding part of the said cheeks.

In testimony whereof I have signed this specification.

f Y ERNEST B.UR1\IMID.` 

